Ran rpcclient just to query an AD controller, I don't have problems getting user information. But for a laugh I decided to try "testme" and it SEGV.
Version: 4.0.0+dfsg1-1 This is a very old bugreport. Quite a lot of things changed in samba since that time. I'm closing this bugreport now with version 4.0.0. Please feel free to reopen it if you think this problem is still relevant. Thank you! /mjt